lucky block, but i dont reccomend farming an easy map as it is very inefficient. I think depending on your skill level
expert map quarry is quite easy and its quick to do.
hard map blue vs orange could be good if you get used to it.
medium map sands of time is easy and quick to do.
easy maps, (i dont recomend)
For me, the easiest map is creeper for sure. I grind it, and I have 24 completions. It is very very easy. If you use /speed it gets even easier. For medium maps, everyone says sandsoftime, but I think mushroomland is wayyyyyyyyyy easier. I have beat it a whopping 26 times, and it is a very fun map. For hard, lots of people say bluevsorange, but I think spaceship is the easiest. I have beat spaceship 9 times. For expert, lots of people say oceanwaves or shatteredworld. Oceanwaves is horrible. No way is it easy. Shatteredworld is way easier, I have beat it 2 times. Also, I grind slimepk expert, I have 8 completions. These are all my grind maps so this is obviously biased. (By the way, I don't have any recommendations for insane, except maybe ancient )